Method of manufacturing low-tension bridge fuses



Oct. 7;' 1930. K. scHAFFLER-GLSSL 1,777,916

` METHOD OF MNUFACTURIG LOW TENSION BRIDGE FUSESv Filed Aug. 5o, 1928 v ly secured to the I the fusesmay be manufactured from the raw Patented oa'. 1, lazo UNITED STATES-PATENT OFFICE 'norman scnnrnnnaonssr., or vIENNA, AUSTRIA METHOD or mANUrAcrUnINoLow-Tnusrou Barn-GE rusas Application led August 30, 1928, Serial No. 303,094, and in Austria Hatch 29,' 1927.

. My invention relates to'a method of manufacturing low-tension bridge fuses i. e..fuses having an'incandescent wire bridging the .current conductors. 'By'such method\ com-` .i pletely y, uniform fuses o'f such kind may be manufactured-wit-houtvany manual labour.

y The improved nethod consists therein that 4a bindingclip made up of conductingmate rial for example sheet metal provided with h, aninsulating coverin'g'or layer at one side is applied to the fuse laminae formin the current conductors by bending theen s of said clip and pressing them lonto said laminas whereupon the required finishing operations u., maybe perforne v Convenientl the fuse laminae/ as Well as the ,l binding clips or the pairs of fuse laminee are roduced eachfronsav continuous tape and oth' `said tapes are automatically fed or cargg ried to the working place, at which suitable lengths are 'cut .from the clip tape having an insulation on one.side`,`theneach length is f laid around a' air o f laminas 'of the laminae tape, which b preference may be tinned pregg, viously, and nall the applied length is firmaminae by pressing. Thus ymaterials in an uninterrupted series of 'operations without any additional work.

:x'o After having cut ofi one longitudinall marginal portion 4of' the laminae ta e the -incandescent lwire or filamentmay e secured to the' free ends of the lamin, which ends have 'been painted with afilux and folded back, -so

x5 as to form a hook. 'Fcrsuch purpose the wire isinserted in the hook shaped ends of two larninae` and said ends are pressed so that the wire isirmly clamped, the tin which is present in such hook is melted by heat for -fixing l thel wire by soldering. The free ends of thel laminas tape' et being connected by the `secenti longitudlnal marginal orticn of sa1d tape are bent or curved so t at a channel is produced in which the current conducting wire maybe inserted and soldered therein.

This continuous lamin tape has as a rule only'in one of its longitudinal marginal poi-, tions a series of holes for enabling the trans. port or feeding movement of the tape during the manufacturing of the fuses.

Figs. 4 and 5 show the continuous clip -tape Fig. 1 shows the continuous lamin tape in the diiferentsteps.- Figs.'2 and 3 show such tape in an end and top view respectively.

invention a continuus laminae tape (Figs.

1-3) is used, whichhastwo longitudinal marginal 'strips 1, 2 and pairs of transversal lamin 3,3A the base portion 4 of which is by p reference enlarge On each of the pairs of laminae a binding clip 5 is vapplied and secured, which holds the laminas in position. v Said clips -5 vare alsov obtained from a continuous tape, which com-l -prises a conducting or metalstrip 51 and anV insulating strip 52, which is fixed on one-side thereof say by cementing and has by preference a larger 'breadth than the conducting strip 51.-

The Continuous lamin tape (1 -4) which is by preference tinned previously, as well as the clip tape (51, 52) isautomatically carried to the working place, at Which the "finishing operations with the exception of the dipping. operation for producing the fuse head are performed without any manual labour.

For exactly stepping or lfeeding the laminae strip a series of holes 6 is punched out, said holes being by `preference edged for example square shape After having cut olf a piece or length corresponding to a clip from the clip tape thev .two ends ofsuch length are bent so as to take a steep position but less than in relation to the center portion, as shown in Fi 4; Thenjthe piece 51, 52 is applied to a pair of v laminae 3 (Fig."'6), whereu yon lthe ends of such piece are bent inwar s (Fig. 7) and finally entirely pushed ldown and-firmly sev10| fuses having an incandescent wire'bridgin'g a the incandescent or cured by pressing (Fig. 8). Thereby the two laminae are rmly held in position and insulated from each other.

After having cut off the marginal strip 1 bridging wire 7 is fixed in the following manner:

The marginal strip'l having been cut off the free ends 8 of the lamellae 3 are -moistened then bentapproximately at right angles and after having applied the incandescent wire, completely folded back -and ressed, so that the wire is clamped in hook shaped folded ends 8 ofthe lamellae. The tin in such folds 8 is melted thereafter by heat, whereby the wire is rigidly secured in the folds 8.

The base portions 4 of the lamellze are curved, beaded or its edges bent off, so that between its vlongitudinal edges a channel is formed, in which the current conducting fuse wires may be readily inserted and secured say byr soldering. Finally vthe free ends of the fuses, which'are yet held together by the second marginal strip 2 are provided in any known manner with the igniting head 9. This may be effected for example by immerging' said ends into arf -igniting mass, for forming the heads 9 (Fig. the fuses may be separated by cuttingoff the second marginal strip 2. n

l. Method 4of manufacturing low tension pair of conduction lamelles, consisting in c utting lengths from a continuous tape consisting of a conducting ban-d having an insulating layer at one side thereof, applying eachl length to a second continuous'conductmg. tape which has a plurality of pairs of such lamellae between two marginal longitudinal strips, securing the applied length to one pair of said lamellae of the second named tape by bending and folding the ends of the length back onto the two lamellae and pressing the clip thus formed, cutting of one margina longitudinal strip of the lamellae tape, bending and fol-ding the' free tinned ends of the lamellae which ends are painted by a flux, over the bridging wire, securing the latter by compressing the folded ends of the lamellaeand then melting the tin present in the fold- .ed 'ends by heating, so

that'the wire is soldered in the said ends, applying an igniting mass to the ends of the lamelles. so as to en-l close the incandescent wire, and cutting off `the second marginal longitudinal Ystrip of the lamelles tape, all of said operations up to and with the exception .of the last named applying operation being performed in an uninterrupted series withoutrany hand labor.

'2. Method of manufacturinglow tension fuses having an incandescent wire bridging a pair of conducting lamelles, consisting in cutting lengths from a continuous tape consisting of a conducting band having an inone pair 10) whereupon "to one side of a second 4folding t e ends 1 bridging wire,

each length to a second continuous conductv ing tape which has a plurality of pairs of such lamellae between two marginal longitudinal strips, securingthe applied length to ofsaid lamellae of the second named tape bybending andfolding the. ends of the length back onto the two lamellae and press-l in'g the clip thus formed, cutting'of "one 'mar-v ginal longitudinal strip of the lamellae tape, Y ending'and-folding 'the free tinnediends of the lamellae which ends are 'painted by a flux,

over the bridging wire, securing the `latter compresslng the folded ends of the lamellae and then melting the tinpresent in the folded ends by heating, so that the wire is soldered in the said ends bending marginal portions of the lamelles so as to form channels `for receiving the current leading wires, final- `ly applying an igniting'mass rto the ends of the laxnellae, so as to enclosev the'incandcscent Wire and cuttingofl' thesecon'd marginal longitudi-nal strip of the lamellae tape, all of .said operations up to and 'with/the exception of the last named .applying operation being performed in an interrupted series- Without any`hand labor.

pair of conducting "lamellae, consisting 1n forming a. continuous conducting tapeso as to yhave pairs of such lamellae` between two marginal strips, applyingfan 'insulating-layer ducting material, cutting lengths from said second named tape, applyingpandsecuring Y the applied length to one pairoffsaid -lamelles of the se ond'namedtape by bendingj/an-d of the length :back onto the the clip thus twolamellae and pressing formed, cutting ofi' nal strip of the lamell tape, bending.; and folding the free tinned ends of thelamellae which ends are painted by a flux, over the securing the latter by compressing thefolded ends of the lamell andy then melting the tin present in the folded ends by heating, in the said ends, applying an igniting mass to the ends of the'lamell, -so as to enclose the incandescent wire and cutting off the second marginallongitudinal strips of the lamellae tape, all of said operations up to and with the exception of the lastfnamed .applying operation being series without any hand labor.

ln witness whereof I affix my signature.

KONRAD SCHAFFLER-GLSSL.

performed in an uninterrupted '-f l Method ofmanufacturing low tension fuses having anincandescent wire bridging a tape consisting of conone marginalv longitudi f lli) so that the wire is soldered iso 

